public class p45x {
	public static void main (String args[]) {
	int sum=0,i,j;
	for (i=1;i<=10;i++) {
	  if(i%2==0){
		continue;
		}
	sum=sum+i;
	}
	System.out.println("sum="+sum);
	for(j=2;j<=5205;j++) {
	for(i=2;i<=j/2;i++) {
		if(j%i==0)
break;
	}
	if(i>j/2) {
	System.out.println(""+j+"是素数");
	}
	}

	}
}
